Open source JDBC 3.0 type 4 driver for Microsoft SQL Server (6.5 up to 2012) and Sybase ASE. jTDS is a complete implementation of the JDBC 3.0 spec and the fastest JDBC driver for MS SQL Server. For more information see http://jtds.sourceforge.net/

Mondrian is an OLAP (online analytical processing) engine written in Java. It reads from JDBC data sources, aggregates data in a memory cache, and implements the MDX language and the olap4j and XML/A APIs.

HSQLDB is a relational database engine written in Java, with a JDBC driver, conforming to ANSI SQL:2008. A small, fast, multithreaded engine and server with memory and disk tables, LOBs, transaction isolation, multiversion concurrency and ACID.

Anti-Plagiarism - software designed to effectively detect and thereby prevent plagiarism. It is a versatile tool to deal with World Wide Web copy-pasting information from the assignment of authorship.
The goal of this program is to help reduce the impact of plagiarism on education and educational institutions. At present, it distributes free software to detect plagiarism.
Checking documents in a format *.rtf, *.doc, *.docx, *.pdf
Check the source code C, C++, C#, Java, ...

phpPgAdmin is a fully functional web-based administration utility for a PostgreSQL database server. It handles all the basic functionality as well as some advanced features such as triggers, views, and functions (stored procs)

ADOdb is a PHP database class library to provide more powerful abstractions for performing queries and managing databases. ADOdb also hides the differences between the different databases so you can easily switch dbs without changing code.
There is also an outdated and unmaintained Python library

SQLTools is a light weight and robust frontend for Oracle database development. This program is not so comprehensive as Tora or TOAD but it is ideal when you need basic data querying capabilities and objects browsing. It also supports a basic subset of SQL*Plus commands (connect/disconnect, bind and define variables).
It works with Oracle 8i/9i/10g/11g databases. Oracle Client 32bit is required.
Check http://www.sqltools.net for more information,
http://www.sqltools.net/cgi-bin/yabb25/YaBB.pl?board=sql_status for development progress and news.